The closer would be better if it had scallops on the O/D, and either about an inch smaller (for single handed use) or an inch bigger (for two handed use). I will have to have a look at work to see if I can "find" a bit of ally 7" dia.
The closer is simply pressed on the nut. I wanted to be able to get it off again, if needed. If it slips, I'll just put a couple of locking screws on.
It was a good idea to leave enough of the nut exposed so that a spanner could be used.
I bought the collets from "Gloster Tooling", as they go up to 30mm.
Overall worth while doing.
It is worth noting that I do have a foot brake on this lathe.